Strike Out on Your Own

Most ballparks let you bring a 16" x 16" x 8" cooler (think two six-packs) with food and nonalcoholic drinks. If you want beer, you'll save cash and calories by alternating it with water you've brought. And you'll stay hydrated—and keep a clear head, making for smarter snacking.

Peanuts or Cracker Jack?

We cry foul on roasted peanuts; a cup has 863 calories. Better: boiled nuts, at 572 calories per cup and 10 times the antioxidant flavonoids. Best: a box of Cracker Jack, with 2 grams of fat and 120 calories. Portion control, whole grains (popcorn) and a fake tattoo? Sweet!

Sit Tight

Bypass fried temptation at the kiosks by using the new At Bat app (MLB.com; not in all parks) to have sushi, which a third of ballparks sell, delivered to your seat. Yes, you'll burn fewer calories than hiking to the counter. But you'd have to run the bases 197 times to work off impulse-buy nachos.

Keep Your Payroll Low

The trend of all-you-can-eat seats, now in a third of parks, offers value—and potential diet disaster. A hot dog combo is cheaper and healthier: Franks have about 320 calories; fewer when they're kosher.